Bill Gates isn’t the only billionaire in Mustique this week. Sheikh Hamad bin Khalifa al-Thani, the Emir of Qatar, is there aboard Al Mirqab, the eighth-largest private yacht in the world, sources say. The boat is owned by his cousin, Sheikh Hamas bin Jassim bin Jaber Al-Thani, Qatar’s prime minister. The Emir is rumored to be looking into buying Mustique’s Great House, which was built by island founder Colin Tennant (Lord Glenconner), who was inspired by a Mogul palace. Glenconner sold it to Christina Onassis’s third husband, Sergei Kauzov. It’s now owned by Lawrence Stroll, a Canadian garment manufacturer. Meanwhile, Jude Law is across the bay on nearby island Bequia.